The Valiant Goloks are indeed very nice blades for thick wood working and at which they excell over machetes mainly due to a lower binding rate, and being much smoother in the cut due to the thin and full convex profile and very nice handles.
There are drawbacks however, maintaining the full convex profile could be problematic to some, especially considering the rough work that machetes in general are used for which can lead to minor edge damage due to inclusion contacts. The Goloks will not hold up nearly as well as a machetes in such work due to the soft spine which allows the blade to take a set rather easily, and only partial length edge quench which leaves the tip and choil area are rather soft on purpose to prevent gross blade cracking.
Thick wood isn't a problem for this, unless knotty, however small diameter woods can ripple the edges fairly easily due to the partial hardening. Such contacts need to be limited to the center of the blade which is very hard and can take even very dense wood cutting without harm. This can be difficult on heavily ingrowth woods however where the tip has to be used.
I recently used a couple of new ones, (didn't write a review as they were prototypes), with a new hardening, which turned out to be problematic. However if they do achieve a full edge hardening with a spring spine, they would be very difficult to compete with for thick wood working ability as they have the optimal geometry. They also do quite nicely on light vegetation and small diameter woods, but a decent machete will do just as well there as there is no binding.
Again though these are precision tools, not general utility like a machete, highly optomized due to the geometry. Of course for those who like to sharpen machetes with files, these are not a good choice, as well as those who like to use jigs or systems like the Sharpmaker. There is no reason why you could not apply a secondary bevel if desired, but the full convex profile is one of the main benefits of the blade and if you sharpen it like a machete the edge will thicken rapidly due to the convex primary grind.
The entry models, the Survival Goloks are also not that much more expensive than a decent machete, costing about twice as much.
-Cliff